Without solicitation or provocation: I installed one of the old generation Arachnid brand rear tires on my F3. At 5500 miles, it is wearing flat across the tread. I'm sure they'll be haters and do betterers, but this is a good tire made for a MC application, at a fair price, readily available via order, that is by far of the 3 brands I've tried, wearing per expectations. And I am not easy on tires.
Wayne
Wayne